Exam 36: A: Growth and Development

In early pregnancy,hormones to sustain pregnancy are produced by the corpus luteum.

Developmental biology is the name given to the branch of life science that studies the process of change over the life cycle.

Adult stem cells can be found in the skin,nervous tissue,and muscle tissue.

The expulsion of seminal fluid from the male urethra into the female vagina is called insemination.

The ovum lives for only about 24 hours.

Because the virus that causes German measles can cross the placenta,it has the potential to cause developmental defects in the fetus.

The prenatal period begins at conception and continues until the end of infancy.

The fertilization membrane formed by the ovum assists the sperm in its passage through the cell membrane and into the egg.

Early in infancy,the baby has only one spinal curvature.

In the female,the müllerian duct develops into the female reproductive tract separate from the urinary tract.

In the blastocyst,the inner layer forms the amniotic cavity and the outer layer forms the yolk sac.

Both spermatogonia and oogonia are diploid cells.

The goal of meiosis is to convert haploid cells to diploid cells.

Stage three of labor normally lasts from 12 to 36 hours.

As the blastocyst develops,the outer layer cell mass forms the amniotic cavity and the yolk sac.

Most of the primary oocytes develop to prophase I of meiosis before birth,and they stay at that stage until puberty.

Meiotic division II is essentially the same as mitotic division I.

After ovulation,the ovum first enters the infundibulum and moves toward the middle of the uterine tube where fertilization occurs.

Constipation and a hiatal hernia can be caused by the increasing size of the uterus during late pregnancy.

The fertilized ovum,or zygote,is genetically complete.